467
Enabling automatic link cost calculation
1. Enter system view.
system-view
N/A
2. Enter IS-IS view.
isis
[ process-id ] [
vpn-instance
vpn-instance-name ]
N/A
3. Specify an IS-IS cost
style.
cost-style
{
wide
|
wide-compatible
}
By default, the IS-IS cost style is
narrow
.
4. Enter IPv6 address family
view.
address-family ipv6
[
unicast
]
N/A
5. Enable IPv6 IS-IS MTR.
multi-topology
[
compatible
]
By default, IPv6 IS-IS MTR is
disabled.
6. Enable automatic IPv6
IS-IS cost calculation.
auto-cost enable
By default, automatic IPv6 IS-IS
cost calculation is disabled.
7. (Optional.) Configure a
bandwidth reference
value for automatic IPv6
IS-IS cost calculation.
bandwidth-reference
value The default setting is 100 Mbps.
Tuning and optimizing IPv6 IS-IS networks
Configuration prerequisites
Before you tune and optimize IPv6 IS-IS networks, complete basic IPv6 IS-IS tasks.
Assigning a convergence priority to IPv6 IS-IS routes
A topology change causes IS-IS routing convergence. To improve convergence speed, you can
assign convergence priorities to IPv6 IS-IS routes. Convergence priority levels are critical, high,
medium, and low. The higher the convergence priority, the faster the convergence speed.
By default, IPv6 IS-IS host routes have medium convergence priority, and other IPv6 IS-IS routes
have low convergence priority.
To assign a convergence priority to specific IPv6 IS-IS routes:
1. Enter system view.
N/A
2. Enter IS-IS view.
isis
[ process-id ] [
vpn-instance
vpn-instance-name ]
N/A
3. Specify an IS-IS cost style.
cost-style
{
wide
|
wide-compatible
|
compatible
}
By default, the IS-IS cost style is
narrow
.
4. Enter IPv6 address family
view.
address-family ipv6
[
unicast
]
N/A
5. Enable IPv6 IS-IS MTR.
multi-topology
[
compatible
]
By default, IPv6 IS-IS MTR is
disabled.
6. Assign a convergence
priority to specific IPv6 IS-IS
routes.
• Method 1:
prefix-priority { critical |
high | medium } { prefix-list
prefix-list-name | tag
tag-value }
By default, IPv6 IS-IS routes,
except IPv6 IS-IS host routes,
have the low convergence priority.
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